What Kind of Sound Changes Can Happen?

There's not really any that much of a difference in what kinds of sound changes can happen. In Gaelic and Irish, we have like nasalization quote unquote, and then lanishin, which is basically things becoming fricatives between vowels. So instead of the nasalization and lanishin things, you could have maybe a germination rule that kicks in a place assimilation rule that kicked in. You could do a lot of different things with this basic concept that we see in Celtic languages of a historical Sunday rule that became grammaticalized. And think about that, think about sundae, and then run through some sound changes that might delete some stuff and voila,